TAMPA, Fla. - To passersby, T.J., a fit 20-something, is running around a red felt carpet about half the size of a basketball court inside a convention center. In his mind, he's wearing a full set of body armor, his face obscured by a ski mask with a death's head silkscreened on it. And he's just dropped a terrorist… »5/18/11 5:20pm 5/18/11 5:20pm